Domain clients don't make requests directly to the FQDN of a domain controller. The client will sent out a request to the DNS server for information about AD servers. DNS returns SRV record information that the client then requests names for.

My guess is this, either the SRV records are missing and or corrupt or you have and issue with secure SMB.

To test DNS and AD try running netdiag and dcdiag.

To test SMB try connecting to the sysvol share on the DC using IP, host name and FQDN

Also check that tcp chimney is turned off - I have seen this impact ability of machines to access the domain.

I assume you have either have had computer account pre-created with your windows ID enabled to join it to the domain - or you have domain admin rights....

Also make sure the xp system is in a work group currently - and has been already renamed to match the computer account noted above - the xp system I notice does not like to be renamed and joined to domain at the same time.

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